Battery checker



FIG. 1 is a left front perspective view of a battery checker, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof.

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a battery checker, as shown. 